chadwick



2 Sheets-Sheet 1.

(No Model.)

L. W. CHADWIGK.

SEGTIONAL STEAM BOILER.

No. 305,289. v Patented Sept. 16,1884.

4 G J74 1 1 I 1'7 J37 6 H' l INVENTOR,

ATTORNEYS.

Nrrsn STATES B atant (h rms.

LAVRENOEV. CHADVICK, OF MILNES, VIRGINIA.

SECTIONAL STEAM-BOILER.

SPECIFICATION "forming part of Letters Patent No. 305,289, datedSeptember 16, 1884.

Application filed April 1, [884. (No model.)

ers, of which the following is a description.

Fig.

Figure 1 is a vertical central section. 2 is a perspective view with thecorner of the hollow easing broken away. Fig. 3 is an enlarged sectionalview showing the connection of the pipes between the upper and lowerchambers, and Fig.4 is a sectional detail showing amodification of thechamber B. 7

My invention relates to the sectional steam boiler for which LettersPatent No. 249,585

were granted me November 15, 1881.

The improvement consists in the combination,with the vertical pipes ofvertical pendent water-leg pipes depending from the upper chamber, andhaving afire-flue through the same, and a lateral connection with theother vertical pipe. It also consists in the peculiar construction ofthe couplings, and in the means for obtaining dry steam, as hereinaftermore fully described.

In the drawings, A represents a rectangular hollow water-chamber, made,preferably, of cast-iron, and having an opening in the con ter for thegrate-bars. B is another hollow chamber at the top, and which isconnected to the hollow chamber A below bya system of pipes, C and D.The pipes G are made up of large pipe 0, reducer-coupling G, and smallpipe C, which are substantially the same as those shown by me in myprior patent referred to. The other pipes, D, however, are

made up of sections D D D D D, and con nect with the short pendentwater-legs, composed of sectionsE E, by means of thimbles E. Each pipe DD,;&c., is connected by a screw-joint to both the chamber A below and tothe chamber B above. The pendent waterlegs are composed of apipe-section, E, screwed into chamber B, and a coupling, E, screwed ontothe section E. This coupling E has a lateral nipple, g, which, by meansof pipe F, is coupled to a lateral nipple, b, on the reducercouplingCentrally through the waterlegs E E there passes a fire-flue or tube, G,

which opens into the fire-space below, and

passes through the steam-chamber B and opens into the smokespace above.These fireflues may be expanded at their ends, so as to hold them inplace;- or they maybe screwed into place, in either of which cases theyact as stay-bolts. The water in this watenleg, it will be seen, occupiesan annular or ringshaped space, and is heated both from the inside andoutside. 1t is supplied with water, which circulates. through thethimble F from the vertical pipes D D, &c., and which prevents thedeposition of any sediment in the bottoms of these water-legs.

In fitting these parts in place the order of theirinsertion isrepresented by the figures 1 to 6. Thus the water-leg E E is firstscrewed into chamber B, and the thimble F is next screwed into thecoupling a. The section D of the vertical pipe isthen screwed into thebottom chamber, A. The reducer-coupling D is then screwed about ahorizontal axis onto the coupling E. The small pipe D is then insertedinto'the bottom or big end of reducer D" and allowed to protrude throughits upper or small end, and is then turned so that the right-handthreadon its upper end screws into the chamber 13, and at the same time theright-hand thread at its lower end screws into the upper end of reducerD Section D and reducer D are next to be applied. D is then to beinserted into D from the bottom and pushed up, while D is screwed upon Dbelow. Then the right-hand threads at the ends of D are simultaneouslyscrewed, the upper one into D and the lower one into D, which completesthe connection of the parts, and makes a system of pipes that can bereadily taken apart for repairs. At the front of the boiler the twovertical pipes O O, beside the door, are connected above the door by aT-coupling and screwed into the center of the upper chamber, B. There isa coupling, E, corresponding to E, below, and which coupling E opensinto the chamber B immediately above the central water-leg, E E, and thefire-flue G of this central'water-leg extends up to the top of thisupper coupling, E"; and

are employed between the upper and lower sides of the chamber B. When,however,

IOO

this chamber is made of cast-iron, the staybolts are dispensed with, andsaid chamber is cast with stiffening webs or diaphragins between its topand bottom sides, as in Fig. 4. Around the sectional boiler as thusdescribed is placed ahollow casing, H, which surrounds all four sides,and is simply set over the sectional boiler from the top and rests uponthe base I, so as to be readily removed when it is desired to inspect orrepair the pipes. This hollow casing has a door, J, opening through thesame, andwatcr is fed to the same at the bottom through pipe (I, andflows oit' at the top through pipe 0, and in passing through this casethe water becomes heated,(forminga feed-water heaters) and the water isalso purified of its calcareous impurities. The coupling E rests in thesmoke-space of the casing, and steam taken from said coupling passesthrough pipe K to the engine, which pipe is extended through the wallsof the feed water heater. By locating the coupling E on the smoke-spaceit will be seen that I get dry or superheated steam. The water,as it isheated in the casing, is taken from pipe cby apump (not shown) and fedinto the sectional boiler at the point f below. This feed-n ater heater,

it will be seen, does not depend upon the exhaust, and does not produceanyback-lash, as when the exhaust is delivered through a series of pipesto heat the feed-water.

The great advantages of this boiler are its cheap construction, greatheating capacity, and economy of fuel.

Having thus described my invention, what I claim as new is I 1. A boilerconsisting of a chamber above the fire-space, a chamber below it,water-legs depending into the fire-space from the upper chamber, andhaving each a fire-flue through it, and vertical pipes connecting theupper and lower chambers, and having a lateral connection with the lowercndiof thewater-leg, as and for the purpose described.

2. The combination of water-leg E E and flue G, the sectional pipe D D DD D, the horizontal coupling-pipe F, and the chambers A and B,substantially as shown and de scribed.

3. The coupling E mounted upon the top of chamber 13 and within thesmoke-space, in combination with the chamber B, the central water-leg,EE, the tube G, and the steam-pipe K, as and for the purpose described.

The above specification of my invent-ion signed by me in the presence oftwo subscribing witnesses.

L. \V. CHADVICK.

\Vitnesses:

Enw. W. BYRN, (nus. A. Pn'r'rrr.

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